Ward, Charles W. and Webb, Peter-Noel (1996): Testing the utility of shallow sampling techniques in the glacial marine environment; Neogene foraminiferal biostratigraphy and paleoecology of marine sediment cores recovered from the Ross Sea, Antarctica

Leg/Site/Hole:
DSDP 28
DSDP 28 270
DSDP 28 271
DSDP 28 272
DSDP 28 273
Identifier:
1997-048249
georefid

Creator:
Ward, Charles W.
Ohio State University, Department of Geological Sciences, Columbus, OH, United States
author

Webb, Peter-Noel
author

Identification:
Testing the utility of shallow sampling techniques in the glacial marine environment; Neogene foraminiferal biostratigraphy and paleoecology of marine sediment cores recovered from the Ross Sea, Antarctica
1996
In: Anonymous, Geological Society of America, 28th annual meeting
Geological Society of America (GSA), Boulder, CO, United States
28
7
174
The record of Neogene marine stratigraphy and biostratigraphy in the Ross Sea region is based on three series of drillholes: along the southwestern margin of the Victoria Land Basin (DVDP 10, 11; MSST-1; and CIROS 1 and 2); within the Central Trough (DSDP 273); and along the western margin of the Eastern Basin (DSDP 270, 271, and 272). Shipborne geophysical surveys suggest that extensive areas of Neogene strata outcrop at the sea floor or just below a relatively thin Quaternary cover, and within reach of conventional gravity and piston corers. In 1993 and 1994, acoustic data were used to select sites and obtain Neogene sediment cores along a series of transects in the Eastern Basin, using facilities aboard the RVIB "Nathaniel B. Palmer". Forty-seven of the 205 cores collected were selected for study, and 110 samples were taken for detailed studies of Neogene foraminifera. Preliminary data indicates the presence of Miocene, Pliocene and Quaternary assemblages within the sampled sedimentary sequences. Samples from seven of the cores yielded foraminiferal assemblages closely resembling those documented previously in the lower and middle Miocene of DSDP Sites 270 and 272. The success of the shallow sampling procedure is dependent on an ability to establish the in situ assemblages and detect aqueous and grounded ice recycling of relict assemblages into younger sedimentary successions. Where lithofacies geometries and sediment derivation sources may be determined from acoustic data, age clustering in recycled assemblages provides a reconnaissance method for determining basin history, bathymetry, and glacial/deglacial cycle paleoecology. Results indicate that near seafloor sampling procedures provide a potentially useful and rapid reconnaissance technique for dating and tracing discrete Neogene sediment packages over wide areas of the Ross Sea continental shelf, for calibration of acoustic facies and reflectors, and for selecting future shallow and deep drilling targets in Neogene successions.
English
Coverage:Geographic coordinates:
North:-61.0000
West:-180.0000East: 180.0000
South:-90.0000

Stratigraphy; Antarctic Ocean; Antarctica; assemblages; biostratigraphy; calibration; Cenozoic; cores; Deep Sea Drilling Project; DSDP Site 270; DSDP Site 271; DSDP Site 272; DSDP Site 273; Eastern Basin; fluvial environment; Foraminifera; geophysical surveys; glacial environment; glaciomarine environment; Invertebrata; Leg 28; marine environment; marine methods; microfossils; Neogene; paleobathymetry; paleoecology; Protista; Ross Sea; sampling; Southern Ocean; surveys; techniques; Tertiary; Victoria Land Basin;

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